package com.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class SetCharacterEncodingFilter implements Filter{
	protected String encoding = null;
	protected FilterConfig filterConfig = null;
	protected boolean ignore = true;
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
		
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (ignore||(request.getCharacterEncoding()==null)) {
			String encoding = selectEncoding(request);
			if (encoding!=null) 
				request.setCharacterEncoding(encoding);
			}
			chain.doFilter(request,response);
		}
		
	

	private String selectEncoding(ServletRequest request) {
		return(this.encoding);
		
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
		String value = filterConfig.getInitParameter("ignore");
		if (value==null) 
			this.ignore=true;
			else if (value.equalsIgnoreCase("true")) 
				this.ignore=true;
			
			else 
				this.ignore=false;

	}

	
}
